1. The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted on May 17, 2013 for each of the trusts named in footnote 3.

2. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $18.33 to $18.79, inclusive. The reporting person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range.

3. Mr. Stuart Cable is a special holding direction advisor to the following trusts: the BTDEL TTEE of Thomas D'Ambra Family Trust I UAD 2/26/97 FBO Abigail D'Ambra, which holds 1,431,095.67 shares of common stock of the Issuer after the transaction reported hereunder, (ii) the BTDEL TTEE of Thomas D'Ambra Family Trust I UAD 2/26/97 FBO Geoffrey D'Ambra, which holds 1,431,096.67 shares after the transaction reported hereunder, and (iii) the BTDEL TTEE of Thomas D'Ambra Family Trust I UAD 2/26/97 FBO Agatha D'Ambra, which holds 1,431,096.66 shares after the transaction reported hereunder.

4. Bessemer Trust Company of Delaware N.A. is the trustee of each trust and has voting and dispositive power over the shares, subject to the direction of Mr. Cable as described below. Mr. Cable has the authority to direct the trustee in the exercise of all powers with respect to the shares, including investment decisions; however, Mr. Cable does not have any direct or indirect pecuniary interest in the shares and therefore disclaims any beneficial ownership of the shares under Rule 16a-2.